Most of what a devops person does is in fact development but it is of the non value adding variety. Basically a devops person spends the vast majority of their time configuring common off the shelf software, scripting this or that, etc.
A singular matrix is a matrix which has no inverse because its determinant is zero. If you recall, the inverse of a matrix is. 1/ ad-bc multiplied by: [ d -b ] [-c a ] If ad-bc = 0, then the inverse matrix would not exist because 1/0 is undefined, and hence it would be a singular matrix. E.g.
s = svd(A) returns the singular values of matrix A in descending order. [U,S,V] = svd(A) performs a singular value decomposition of matrix A, such that A = U*S*V'. m > n â Only the first n columns of U are computed, and S is n-by-n. m = n â svd(A,'econ') is equivalent to svd(A).